Instrument for indicating the temperature of cooking articles.



J. NIELSEN & S. A. C. KEISTENSEN. INSTRUMENT FOR INDIUATING THE TEMPERATURE OF COOKING ARTICLES.

APPLICATION FILED MAR. 16, 1908.

945,978. Patented Jan. 11, 1910.

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JENS NIELSEN. OF COPENHAGEN, AND SIGVALD ALFRED CHRISTIAN KRISTENSEN, OF SOTORP I-ER VALBY, NEAR COPENHAGEN, DENMARK.

Specification of letters Patent.

Patented Jan. 1.1, 1910.

Application filed March 16, 1908. Serial No. 421,455.

To all whom '51 may concern:

Be it known that we, J ENS NIELSEN, merchant, a subject of the King of Denmark, (whose postal address is 7 /9 V estervoldgade, Copenhagen, Denmark,) and 'SIGVALD AL- FRED CHRISTIAN KnIs'rnnsiaN, printer, a subject of the King of Denmark, (whose postal address is Sotorp per Valby, near Copenhagen, Denmarln) have invented a new and useful Improvement in Instruments for Indicating the Temperature of Cooking Articles, of which the following is a specification.

The object of this invention is a needle adapted to be pierced into the food during the cookin operation, and there signalin automatic. Ily the attainment of the desired tem erature.

T e needle consists of a very thin metal tube provided, at its lower end, with a point adapting it to be easily entered into the meat &c. whose temperature is to be gauged. Connected with the needle is a spring held in tension by means of a substance melting at the temperature to be indicated and therebyreleasing the spring, so that a pin or button shoots up from the needle as a signal that the proper temperature has been reached.

It is an important feature that the apparatus has shape of a fine needle which is easy to thrust entirely into the meat &c. whose temperature is to be determined.

In the drawing Figures 1-3 show various modifications of the needle.

The apparatus shown in Fig. 1 is constructed in the following manner: 1 is a long hollow needle ending in a point 2. 3 is a short tube of slightly larger diameter than the needle 1. This needle and the tube 3 are soldered together and provided with a disk 4. The needle-1 has further some impressed embossments or rings 5. Inside the needle and fitting the bore thereof is placed av long in 6 ending outside of the tube 3 in a button At its other extremity the pin 6 is thinner and near the embossments 5 it is provided with indentations, bends or twists 8. 9 is a certain substance or metal introduced into the needle 1 in molten state where it solidifies inside the embossments 5 and around the pin 6 with the indentations 8 which pin, by a pressure on the button 7, is

there y the button 7 upward, Fig. 2, and

in order to prevent the elical spring from throwing the pin 6 entirely out of the needle, when the metal 9 melts, nearest to the button 7 is somewhat re in diameter, so as to engage a groove turned in the pin 6. 0n the other hand, the coil of spring farthest from the button 7 is somewhat extended so as to fit, by its own elasticity a groove provided on the inside of the tube 3, for instance at its bottom. In this manner the spring is fastened to the pin 6, as well as to the tube 3, whereby the two parts are prevented from separatin entirely, but this connection may easi y be released and again effected.

Fig, 2 shows substantially the same apparatus as Fig. 1, but in a neater manner of execution. The needle 1, the tube 3 and the disk 4 are here replaced by a single fine tube with an enlarged portion 11*. By this enlargement a groove is formed inside the needle 6, and therein fits the above mentioned lower coil of the helical spring 10. In this figure the helical spring is shown released, as the metal 9 is supposed to be melted and the press button consequently elevated.

In the manner of execution shown in Fig. 3 a helica spring 10 is placed in the lower end of the needle, so as to be partly or entirely immersed in the substance 9 fusing at the temperature in question. By means of the Y in 6 the spring iscompressed,while the su stance is liquid, and as soon as it solidifies, the spring 10 is locked in its compressed state, and the pin 6 as well is maintained .in its lower position. When the needle is inserted in the meat, and the latter has reached the desired temperature, the fusible substance will melt, and the spring 10 will then beable to press the pin 6 up from the needle, thereby indicating that the desired temperature has been reached. The fusible substance 9 may consist for instance of the following mater1als:-lead, 12 ounces,

the coil of spring nee ' tin, 4- ounces, bismuth, 16 ounces, cadmium, 3

muth, 17 ounces, cadmium 4 ounces, or lead, 14 ounces, tin, 3 ounces, b15- ounces. What we claim is i 1. A temperature indicating device comprising a thin hollow needle, a fusible substance therein near the point thereof, an indicatin device extending within said needle retained by said substance when solid but released by the melting of said substance.

2. A temperature indicating device comprising a thin hollow needle, a fusible substance near the point thereof, an indicating device retained by said substance when solid and a spring device for moving the indicating dev1ce when said substance is molten.

3. A temperature indicator comprising a pin'when releasedby the melting of said substance.

In witness whereof, we have hereunto signed our names in the presence of two sub scribing witnesses.

JENS NIELSEN.

sievlnn ALFRED CHRISTIAN KRISTENSEN W1tnesses HERMAN R1512, J ULrUs LEHMANN. 

